Dual Monitor with Dual Video Cards

I am trying to setup a dual monitor config. I have tried the following with no luck:

----"The first thing I would recommend is uninstalling all your video drivers, shut down and take out both cards from your motherboard. Re-install the PCI card, then boot up into your bios. It just depends on the motherboard, but there should be an option in your bios to boot into either AGP or PCI first. Try setting to PCI, then boot up, Windows XP will install the default driver which you can change afterwards. Then shut down and install the second card (AGP) and boot-up letting XP install drivers.

If this doesn’t work then try switching the bios to AGP first, then reboot. If this doesn’t work then start over taking out both cards and installing the AGP card first. It really is a matter of trial and error. "---

When I set the BIOS to display PCI slot first, the PC boots, but when it gets to the part where it would show the XP screen, the monitor stays blank, but the light stays green, like its receiving a video feed, but not displaying. When I display AGP first, the pc boots into XP just fine, but gives "This device cannot start (Code 10)" on the PCI card.

Code 10
If the device has a "FailReasonString" value in its hardware key, that string is displayed as the error message. The driver or enumerator places this registry string value there. If there is no "FailReasonString" in the hardware key, the following generic error message is displayed:

This device is either not present, not working properly, or does not have all the drivers installed. (Code 10)

Try upgrading the device drivers for this device.

Solution button: Update Driver

To resolve this error code, make sure the device is connected to the computer correctly. For example, make sure all cables are plugged in fully and that all adapter cards are properly seated. Follow the suggested solution button and update the device driver. It may be possible to remove the device and redetect it using the Add New Hardware wizard.